2002 Buick Lesabre Rear Caliiper

A. G. SULLIVAN

2002 BUICK LESABRE

Brakes problem
2002 Buick Lesabre 6 cyl Front Wheel Drive Automatic

I too need to remove and replace the left rear caliiper. I know from when I did the pads that I lremoved the lower bolt and rotated the caliper out and then replaced the pads. But to REPLACE the caliper, how do I get at whatever is behind the rubber cap where the top bolt is. Is it a torx, allen? So PLEASE tell me how to remove the caliper?